Practice question
Question
For 2NO(g) + Cl₂(g) <=> 2NOCl(g) , Kp = 9 at 500 K. If initial pressures are PNO = 1 atm , PCl₂ = 0.5 atm , what is PNOCl at equilibrium?
Explanation
Let PNOCl = 2x , PNO = 1 - 2x , PCl₂ = 0.5 - x . Kp = ((PNOCl)²/(PNO)² PCl₂) = ((2x)²/(1 - 2x)² (0.5 - x)) = 9 , (4x²/(1 - 2x)² (0.5 - x)) = 9 , x ≈ 0.45 , PNOCl = 0.9 atm .
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